Tool-holder for lathes.



F. D; VAN NORMAN.

TOOL HOLDER FOR LATHES.

APPLICATION FILED IuLY 29, 1913.

1 1 4 1 ,854; Patented June 1, 1915.

FREDERICK D. VAN NORMAN, OF SPRINGFIELD, MASSACHUSETTS.

TOOL-HOLDER FOR LATI-IES.

Specification of Letters Patent.

Patented J une 1, 1915.

Application filed July 29, 1913. Serial No. 781,735.

T0 all whom it may concern:

Be it known that I, FREDERICK D. VAN NORMAN, a citizen of the United States of America, and resident of Springfield, in the county of Hampden and State of Massachusetts, have invented certain new and useful Improvements in Tool-Holders for Lathes, of which the following is a full, clear, and exact description.

This invention relates to improvements in tool posts, or holders for tools, to be carried by the slide rest of a lathe, and is ofthe same general character as that described and shown in reissue patent dated June 24, 1913, No. 13,584, granted to me.

One object of the invention is to provide a construction of'tool holder whereby lathe tools having Shanks of different sizes or cross sectional proportions may be held in proper working adjustment at the given or most appropriate height for the efficient performance of their cutting actions.

Another object of the invention is to provide in, and as a part of, the tool post, the clamping member which is constructed or equipped for a three point bearing, that is for bearings by two separated portions or projections thereof upon the tool shank and by a third portion or projection a bearing on a suitable supporting portion of base of the tool post.

Other objects of the invention are attained in and by constructions of the device which will be hereinafter pointed out.

The invention is described in conjunction with the accompanying drawings and is set forth in the claims.

In the drawings :*Figure 1 is a plan view of the tool post together with a portion of the lathe slide rest by which the post is carried. Fig. 2 is a vertical sectional view on line 2-2, Fig. l. Fig. 3 is a sectional elevation as seen at right angles to Fig. 2. Fig. 4 is a perspective view of the clamping member of the tool post constructed for the acquirement of the three point bearing. Fig. 5 is an elevation of the same. Fig. 6 is a perspective view of one of the rockers. Fig. 7 is a sectional view as taken on line 7-7, Fig. 3, through the base clamping block of the tool post only.

In the drawings A represents a portion of the slide rest understood as movable in the usual manner on the lathe at one side of the line of the head and tail stocks',-B representing the upstanding post, the bottom enlargement of which has an adjustable engagemcnt in the T-slot a.

C represents the lower or base clamping block, and D the upper clamping block, both of which blocks have vertical holes c and c, about centrally thereof for the accommodation therethrough and therebeyond of the bolt-like post B.

The lower clamping block C has a plurality of parallel straight upwardly opening channels Z Z which open endwise at the edges of the block and which are of suitable depths, the same being here represented as both of the same depth. The bases of the said channels l CZ are similarly curved on arc lines as indicated in Fig. 2 and shown in Fig. 7.

The lower clamping block has at opposite portions thereof which are outwardly beyond, and in a line with each other, which is at right angles to the lengths of said channels, slight depressions f f, the bases of which are curved.

fm, m represent rockers or rest bars, each of which is of the same general shape as that represented in Fig. 6, that is it has an arc shaped bottom conformable with the curved bottom of the channel d in the lower clamp block in which it is fitted, and a straight top.

As represented in Fig. 8, one of these rockers m is considerably thicker in vertical dimension than the other so that notwithstanding the Shanks of lathe tools may vary considerably as to thickness, they may by reason of the varying heights of the upper surfaces of the rockers in the channels be supported and held with the point or working end at exactly the proper height relatively to the line between centers for the most efficient cutting action on the work in the lathe.

The lower clamping block having a plurality of the curved bottomed channels d,- two being usually most desirably provided,-has threaded studs o o penetrating with screw engagement through their outer walls and engaging in arc shaped grooves t in the sides of the rockers whereby the rockers, while very free for their rocking movements so that the inclination of the tool supported thereon may be changed to bring the point thereof to the proper working height, are restrained from disengagement from their proper places in the channels d.

The upper clamping block D has two separated depending bosses or extension memllO bers y' j; and at the end portion of the' upper clamping block which is opposite from that having the depending members j y', the clamping block is provided with a vertically threaded screw hole through which the shank of a screw g engages, said screw having a knurled head or enlargement.

The lower end of the screw is rounded whereby it is adapted for a rocking bearing in either of the aforesaid depressions f of the base portion of the tool post.

E represents a collar surrounding the post i B above the upper clamping block, the 4same being concave in its under side for a rollingl engagement with the upstanding curved rib Vf: of the block D; and G represents the locking nut which screw engages on the upper threaded eXtremity of the post and is oper- -ative to confine the upper clamping block vto firmly bind, between thelatter and the lower block, the shank of any tool, of any size within the range of accommodation of the present device, and in a horizontal position or in any oblique adjustment.

As it will be perceived from the drawings, the tool w having its shank supported on 'either one of'the rockers, and either in a -level or an inclined position, is held at two separated points along the length thereof` by the depending bosses or projections y' j of the upper clamp block; and any rocking movement of the upper clamp block is prevented by its having a fulcrum through means of the lower rounded end of the screw g on the base portion of the tool post.

The screw g is adjustable vertically through the threaded hole thereof at one end of the upper clamp block so that the third `pointof bearing, acquired by the rounded lower end of the screw, may be much or lit- -tle'below the underside of the clamp block as may be required on different occasions when tools of different sizes of shanks are used 1n the tool post.

In Fig. 3 a tool a: is represented as held between the upper clamp block and the `rocker n in the lower block, but if the tool were to be held between the upper clamp block and the rocker to the leftward of the post, the upper clamping block would be turned around end for'end so as to bring its two separate bearing bosses j y' to the lei-rt of "the post while the third point of bearing, by the screw g,would be to the rightward.

rIhe clamping blocks as desirably done'on vsome occasions, may both be turned or swiveled together' relatively to the post'.

I claim j 1. In combination, a tool holder comprising lower and upper clamping blocks, the lower block having a tool support, the upper block having two separated clamping portions, adapted to overlie the tool support.

'fand atan opposite portion thereof` a third 'bearingportiom meansfor affording afbearing support to said Athird bearing portion and means for confining a tool' shank between the said tool support and the two separated clamping portions of the upper block.

2. In combination, a tool holder comprising lower and upper clamping blocks,.the

lower block having two tool supporting members the upper surfaces of which are at varying heights, the upper block having two separated clamping portions adapted to j overlie either of said tool supports, and a supporting membersu being at varying heights. j

4,-. The combination with a tool holder having an upright bolt, of lower and upper clamping blocks having apertures for said bolt, the lower block having an 'upwardly opening channel with a curved base, atool supporting member adapted for engagement in said channel, the upper block Vhaving at its one end two separated clamping members, and Aits opposite end adjustablysupfY ported above'the lower block,V and `means carried by the bolt? and located above `the upper block for imparting a clampingbind thereto.

S5. Ina tool holder, in combination, a post,

a lower and an upper clampingblock having apertures for said post,"the lower block having two tool-supporting members, the 'tops of which are `at varying heights, the upper -block having its one end formed withtwo separated clamping portions, andadapted to overlie either of said tool supports, and havving its other end supported over the lower block, and means carried by the post and located above the upper clamping block-for" imparting a clamping bind thereto.

6. A tool holder Vcomprising lower and upper clamping blocks, the lower block having a plurality of tool supporting'members at diiiferent parts thereof, the upperblock'lA having two separated clamping portions at its one end adapted to overlie either of said tool supports and having itsother endadjustablysupported over the lower block and means forconining a tool shank between the two point clamping portion and lone of the tool supports. j j

7. In a lathe tool holder, the combination with a slide restuhaving an uprightV post adjustably "engaged therein, of upper and lower clamping blocks having vertical apertures through which said post passes and whereby said blocks may be individually swiveled on the post, the lower block having a plurality of upwardly opening channels in portions at different sides of the post, and tool supporting members of varying heights in said channels; the upper block having a clamping portion adapted to overlie either of said channels, and means screwV engaging on the post and operative against the upper block for confining it in its engagement with a tool in either of said channels.

8. In a tool holder, the combination with an upright bolt, of lower and upper clamping blocks having apertures for said bolt, the lower block having two upwardly opening channels with curved bases, and tool supporting members of varying heights adapted for engagement in the said channels, the upper block having its one end formed for engagement on a tool shank, and having its opposite end adjustably supported above the lower block, and means carried by the bolt, and located above and coacting with the upper block for imparting a clamping bind thereto.

9. A tool holder comprising a base and an upper clamping block and means for imparting a clamping bind thereto, the base block having a plurality of Atool supporting members, the upper surfaces of which are of varying heights, the upper block having a clamping portion adapted to overlie either of said tool supports.

Signed by me at Springeld, Mass., in presence of two subscribing witnesses.

FREDERICK D. VAN NORMAN.

Witnesses:

WM. S. BELLows, G. R. DRIsooLL.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

